Improvement in rotary cutters for marble and stone molding machines



vR. ABDREY. Rotary-Cutters for Marble and Stone Molding Machines.

No.147,033. Patented Feb.3.1874.

IZ /j W29; eaves, v 70 wm UNITED STATES PATENT QFFICE.

ROBERT ARDREY, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN ROTARY CUTTERS FOR MARBLE AND STONE MOLDING MA CHINES.

Specification forming part of Letters Patent No. 147,033, dated February3, 1874; application filed September 22, 1873.

. as will enable others skilled in the art to which it pertains to makeand use it, reference being hnd to the accompanying drawings, which formpart of this specification, in which Figure 1 is a side view ofcutter-head with single set of cutters. Fig. 2 is a side View ofcutter-head with double set of cutters. Fig. 3 is a detail view insection, showing the intersection of cutter'plates. Fig. 4 is anunder-side view of grooved ring for securing cutter in place. Fig. 5 isa horizontal sectional view of cutter-head.

This invention has relation to cutter-heads for marble and stone moldingor cutting machines; and it consists in the novel construction andarrangement of the cutters and the devices for securing the same to thecutterheads, the object being to provide for the removal of said cutterto be ground, and the ready replacement thereof.

Referring to the drawings, A designates the core of the cutter-head,having the slots B B out through from side to side, and intersectingeach other. 0 designates the cutter, designed especially for forming themolding on marble or stone, and having their cuttingedges curved to suitany desirable pattern of molding. The cutters are made from plates ofmetal, admitting of some variation in form and arrangement, as indicatedin the difi'erent figures of the drawing.

Fig. 1 represents the four cutters formed from two plates, each havingits both ends ground, respectively, from opposite sides of the plate.These plates are inserted in the slots B B at right angles to eachother,being correspondingly notched, so as to intersect, as shown. A wedge, Bis then driven through the slot B, which is the longer of the two, abovesaid plates, and a grooved collar, B placed on the cutter-head or coreabove them, and its inner flange fitted into the notches b in theirlonger edges, (having their inner walls flush with the surface of saidcore,) while its outer flange is notched to receive the edges of theplates.

In Fig. 2-is shown a form of cutter-head capable of being reversed, soas to utilize two diflerent sets of cutters. Each slot is of sufiicientlength to receive two plates-one above the other. The plates of each setmay be notched so as to intersect, as shown in Fig. 1; or one plate ofeach set may be made without the intersecting notch, and two separateplates placed in the head at right angles to it, their inner endsresting against its sides. The two sets of cutters are secured to thehead by means of two collars fitted closely together, and resting, asshown, in notches formed in the shorter edges of the plates. The collarsare secured rigidly to the core by means of pins a passing diametricallythrough both.

In the drawing, the upper cutter-plates in Fig. 2 are illustrated asbeveled in a direction contrary to that of the lower cutterplates. Bythis means, on inverting the cutter-head on its spindle, the uppercutters will be brought into the position of, and cut in the samedirection as, the lower cutters, and this change may be made when thelatter becomes dulled.

Instead of making the cutters beveled in contrary directions, as shownin said Fig. 2, the bevels may be all in one direction, either right orleft; then, on inverting the head, as before, the bevels or edges willbe in position to cut in a contrary direction. This is often desirablein cutting irregular forms, or forms having corners or abrupt turns. Insuch cases the cutters would be started, and would cut up nearly to thecorner of the slab or plate, the movement of the table being, say, tothe right. The machine would then be stopped, the cutter-bed be drawnout, the cutter-head inverted, and the table moved in a contrarydirection, say to the left, the cutter now cutting from the corner untilit met the out which had been started from the opposite end of the slabor plate; so, too, the cutters may at any time be made to cut in anopposite direction without being moved, by changing their bevel byfiling, and reversing the movement of the machine, and the uppercutters, if the machine be made strong enough, may operate on one slab,while the lower ones operate on another.

3. The collar having its under surface grooved and outer flange thereofnotched, in combination with the notched cutter-plates, as shown andspecified.

In testimony that I claim the foregoing I have hereunto set my hand this5th day of September, 187

ROBERT ARDREY.

Witnesses:

T. A. CONNOLLY, EUGENE P. EADSON.

